Electronic pen



FIG. 1 is a perspective view of an electronic pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is bottom plan view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for an electronic pen, as shown and described. 